Flushing dirty buffers out of the buffer cache is influenced to the greatest extent by which of the following process?() ["ARCH ","SMON ","LGWR","SERVER"]
现阶段我国法定的社会保险有()种。 ["二种","三种","四种","五种"]
喷油嘴针阀磨损后,容易造成()。 ["喷油量增大","喷油量减少","喷油提前","喷油压力增大"]
柔性接口的刚性管道的砂石基础结构,设计无要求时一般土质地段可铺设砂垫层,亦可铺设25mm以下粒径碎石,表面再铺()mm厚的砂垫层(中、粗砂)。 ["10","15","20","25"]
碳素钢按质量分有()、()和()。
一类危险区是怎样划分的?